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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91aa974c2109fd8e7be2b3869f33c8ae9f40ecc1826f7c7afe3e421e36ebbf3' 
  AND token = 'hf9KwPHFeScb1gnQ+jW9m8tlGjU1SeJBtikcyc5OWRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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