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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb5175751ee802b39a8361886314de2899885c8f26d2f77d5954295d854e71e' 
  AND token = 'ium/TWzR7Pq8gJu4ui2Iq1+5H6RfyQAzHLb85z8Fjo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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