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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02c5978f9a0ac170f1d7dec8783121073f8be39567d3640672cd35b399e4014' 
  AND token = 'MGWsRXk7VifsgfpQo1qEn124oTMnFoxREOJ9sCzRJ0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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