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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8172dcbbf8c1b3efb1f9a1b278315c4aaa3fae0e02c5d2ba31d0845b4397f2bc' 
  AND token = 'N1VSE3+bjxMw9LsazrIV1iQkkoVA0w4yvbbwKw26Ehc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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