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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd3b7e4eeed3a4ef720a1af97f781ffc4b82acd999a034cadaa564d27d28833c' 
  AND token = 'uD4AnyibJw/fNEiXkB4UEThL3o8ItHkY94oeN0Cr+P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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