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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5631d12b562c2407e6aa6349197f92bd11809e9d348ba6db233557b0399020a5' 
  AND token = 'rStWAxIXrDvtapypnvNfZ8YZr4qGrfNs7BrRu0LtlFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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