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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45bdec54f2bb98387d5011a804fb918c3d8a7e7ffe2f0462330a05e31797a63c' 
  AND token = 'AST0nUj1Yu0o61shHW1k4KcapHkG/M4nXkz59m9dwkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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