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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28b2eba20055d8617a3f24e0393c5502d87cc7660d667c36cb3d29f7f610eac' 
  AND token = 'jraH/f1Y3EQzesd6Ah1aHU7/EiaWshwgdVzhvbeo3QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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