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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03313e349adde2421e569871aa099a49c404b3becd6b82606ee838cfc7dfed4d' 
  AND token = 'b6FK3Rlzm6RMfo1ZHo/4axbIsB0ZzOMIESq6PYYnkk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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