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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fffea316784048a6bb5b897a2fd5b387bf57baed308660233f91ed0f456bac3e' 
  AND token = 'ebUORZiX8Grv6JVcleDsxg/hbJVqpy2ucMOf/VvIoyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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