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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '672335a50b768b62fb33605c88e0dd1af1e2dda22be94d9b4013ead96f4e9112' 
  AND token = 'M1z6SvTwGn/Py36Bqw3ZGI1+3V3Pp7TfmcCbjskVxC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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