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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95b57b73e0645f09aff7b3fb647064984311720a01b61df82d7cd7be1c94466a' 
  AND token = 'MmMUaR2EflheeJ9su0Kl7tufxzF99QQ+8Ju8CN3TsT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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