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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8621a32b3305dabfa1d8a2fe3e017dc7cb305fabb1ab8719548c8a856d327899' 
  AND token = 'AfGrptn45E1SDt9mm8iMBNceXw3Fo/VH5nB8ocgw4kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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