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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8107f867effb449e7ea3858603a93d5aacf7be807fc07e25a5309599f9a92f7' 
  AND token = 'fJKXVbU29rFnjihfQVHKBBfBJ60DdOmgiKSiu5yqBjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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