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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6f47911ff1e27dc7e5861da56a80447f4ad33d5ac57d193dfeabb196843bb4' 
  AND token = '7evKxFyqyCILMh6m1X1hLbIG9rg79D2LS5upWFGph8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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