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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6d558646dfd3d2e438e1447d9be3eb76df8d844aeab7227bbc16a612f01b09c' 
  AND token = '+a1+uN0IF8jAlHyf30EtsF/nPaEuRptNS+t1tNM+ffA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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