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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76eebdb43c9d37c8106de370332d8853ff327a475635b0b536d69da62e4fd178' 
  AND token = 'r8r7eYAHVgtZMgx3pfIorjlLec8vrfQjHruO9d5eJ08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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