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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df62e7caf4af594ff843a09d5ba1261fda7cf197f62d3ac0586a445f605992d2' 
  AND token = 'oy5ByrdgNMstGZ6xPL2z10gYfmMEKUOkpNeb1KyE4/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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