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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5db6dd7e3049c033131e50f73512157325800f5d15a496717dfe106ad8e96e9' 
  AND token = 'Q8agDsmIKM+aons+wprq3gnbVhXy2+ZbVgDs9+wbWQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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