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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efabcb0475f89822737d5f65db5637df94fda000568f14d22a9c22fd50363409' 
  AND token = 'wtLbeeWLUeEUTrowm2EEcSSrEfyoJF6jdXUz8GLfvR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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