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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d1a1b48e11746b8878d1fc5d084ec5aa9211b459d2034221bc494c2e484ae0' 
  AND token = 'uDWUXlWxkSN2pDqTHXdRH9187P1U3E8wPHKshceY0e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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