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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c813553c82f7ae99f2045c8b7cfeea11cfed7b9d45435abb0500d68489ad2dc' 
  AND token = 'XJZdSYXK9vCE0S7+/o29Kuu0hFIl3dfHeuYk80W1XCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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