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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0966eca396bcf29a97e1b989427e0f1c8546d34fd8fdc1245bc93ee5407e6fb' 
  AND token = 'F9em68wEomdcGWPLSyT4obQsxTmGmDR6ALKJTNAPx4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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