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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dedbe58e7621bd9343d53938d71bdfa2837c8ea8c3b809088fde01e08e51eb2' 
  AND token = '/AYFl87gGR8iCHrKMz5ZB4WJ6wzYtdNLadtK9zl8y+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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