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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '257337fe546b50b77bb56d884c08c53ec709c6b4308937faa9f8fc06fef45398' 
  AND token = 'WdiQFvO4xQqX2s0+HomWxZFt1Bw8hs7d5Iv191t4WMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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