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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b08b69e59ed5f118bd36589ed8057df6f83cebdb5142e1f25147d361c19b1ba7' 
  AND token = 'tkZoEmZADB77FFpVPfrKpURX2R0M6aWFGJLUAyhyurM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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