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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3008bfbe31802897e29940c5d7ff57946f31547fff09cec0fd0e12d0a9d12a5' 
  AND token = '60OyDKFhAdcXWEzFPL+A6Rf4PMYIzSUxtelC3ZNBjGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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