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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee55722edd6d54eaa6c08d4ff47ed8f1b4e2433baee7b2cd6a1a4dc697c2c7a' 
  AND token = 'u5OEEBlfzGOKSYp73bAx7FdqbKOcVJZ7Fq0exOckid8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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