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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26dfe2ac093ebe2393406b3fa245836f6be01989f01780f6a43a1a7e9296c67a' 
  AND token = '0QIAf2l57MOMHv/VuukFV/VZmjcEfXt2x0xrARcYBrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}