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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba95d2506a7ed36324f5c667203b2524a2a817358d1acca89472192c3cddd00' 
  AND token = 'rud3ECnVH930k2zDZcf+a7C7f7QpjB+R4Ia+gcobY+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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