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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '438ab98b2620b9fba06de922b236e9bef400907a500d4473507dddb4e8b0e4f9' 
  AND token = '5WOsUEVtqyJqfT2TExwOSqD560hq+xqsaingrMN9G94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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