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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e2a5940ba1a3e16fcc54c1952ee96a7385b3b2abc45127df468f62fe32d56c6' 
  AND token = 'g49+/js4DFivPIFD+bXIaFXoxd7+9Z9/IG53RPmmgIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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