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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cdcdab54c7ce9edfd0ffc1fa03f9c3fc729397cf157562b8f2c1c7820ae8847' 
  AND token = 'E2kJbkf7c+3zHMBmscvhwvSuq9meBw3PiZ6EFOlN5/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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