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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28bf50a7904229821ef3cb147ef589094b861aa99baa9805c527ae09ae29498b' 
  AND token = 'jR7q/Phtd6O7EI6QqkzQfTXX1Ma/GuLpeQjniBQuV6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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