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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad095ca1066276114388d745c70521b8ce884d47c9dfbbcb31741e23040a4a9a' 
  AND token = 'P3CSle71QMmxj1MWgyw7j0EVtDUTANiielUCZIpV7I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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