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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bba9fc4960d3f4267a78bfebc3cd8a9394541b92094c9a4c4c04fbe13177436' 
  AND token = 'j9j7CKPxVPHWaJhz9yRE3miLI0j6tsLMFTUiqvY7CUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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