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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93b94e112584f66ce7785d4ef1a0ca5e8ff417a2d6ea687a00f3802a112415a' 
  AND token = 'CTXmncDTyIChShR0m/YQFzUs9y8vnUIDuW79/s7hQuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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