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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde3b4715b0e346f061645435a5c21fabe35ef6ded99e8b264b4d18c5fb298cc' 
  AND token = 'QnDfbAIYEBqFCGCZ3dia5nECFZDIblH8IPYrdX66/TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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