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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e37971102b35dcf2888172b47eb78737cb39d340d11e7f1b1c4b924a1669ba9' 
  AND token = 'xjtJ1Fcwbgx+grqnz1Y0JRYaoz4BQBR+HsgGiP4W9Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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