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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee7081caefb3ee4adfc56ed8fae82db72a60751899b4630405e77007305264ef' 
  AND token = 'DQGe2BevYpvSoZS/hCW387fZRBb7j2MivuQS58z5aGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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