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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '451f991893a258f3799d5a55608cf0e57c4ad2bbaf9eb53f268d0ce0211288d9' 
  AND token = 'npaDOEsEYB4OwzR5BXvBldKqxezgYaBScwY1lDobJrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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