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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65f628c809949f1739ebeafd35b9e9553261a167985f71a7e0b2ac3a1a916b3a' 
  AND token = '5I5ycw3XSRsfTfTTdDz1/XvwOdua1oSsjuPUIQ6a2Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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