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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6f2c778ecf54baaee6b439e4d5886d5254bcac8ab530a2025825ead6633575' 
  AND token = '038HnoUCeDa1u5aN4wJZwaO7Q0Y25jEiaIgvPb85fOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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