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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0ffcd764834535283a362a532b272667a3257f91f33f1617316e2a0f6444951' 
  AND token = 'QJTLLpEABAwRoh6T7C4wi4uXUzL1U8DREX6A9PPY1I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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