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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa2360ab356c65afb6e0bb08268d6a292175df7260e84c8872f24cb37f7484d' 
  AND token = 'TK6govocjc89C331+l4iVcsJfStbp/jvjw5L/9oSFRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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