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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b0040c7c4cb729953bae768c965c24d804a0f105db8286b08dc7c1d9e8a9f36' 
  AND token = 'IyOQNfukCCIzvJmiuCtGXTi4JuEZ95M3Y++cDBVhut8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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