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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b3fcd6e0c510148ed403a133ea5af6ce334b15ce9718cee6f6da5eb73bb1c3' 
  AND token = 'injfsWrPUQ8I7/uchqqcHhNfHDxk1QEqnFOtvH0h080=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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