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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d93f6ef62bf73504335632d1de4b5dec5db81b13297c4cbacc93403e808ed79' 
  AND token = 'UhzeXAgmHWey2cqAD3Wjqb/80T21PVEnmiXlfx9XA+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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