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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30105c33e95370e173340986251ebdc41c93cdd260f8036ea7a403171d42b42' 
  AND token = 'nIYNWqEk5ohMEUlU/ldi6zc0iu4CKsUpe350zh2mL3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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