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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b0d39c50f98c08273487f947ddb905012bfd1fdc4860d2a929df70d98bbf082' 
  AND token = 'xZoBxxRBq+L9wh6h+aUgks66674iCZW6qsG7UZOqwb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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