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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a108a2409f801fbbacf92a5a150a14b142ee6b6203efebcf592d2c931301342c' 
  AND token = 'S+XN5I/GVysrM/yS+a/5w/idniPruKyJdp1IhYDHI2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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