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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c9bc9cb5d86a29598d2f2c56b9d73cf7605cde8d3fe7b2ea3c5f2831cb8986' 
  AND token = 'saMl8VUUd2I3c8U7+SGSLyW9thk5H0ENsLFfnABv7HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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