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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '884238a239d06f4df3cddb8bbeedb6823a346c7bf34b481f3529f4cf741540fe' 
  AND token = 'TF7SHUfZu19jSSIuLXNcmTz9bMrtLwU/qoq94Ul9keQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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