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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0dbd27b8fb6399aaf097f39855bf41cf151718d948c6515e9bd6427f8a65dac' 
  AND token = 'v3MXn3tN4UtNdWqXSabarptLE80e+m2Tej95701KgOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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