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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b67bda7ec8706436dbaa5084c066ab0aacaa3db75f91ccab7ee25888d16058c' 
  AND token = 'EQH3LqcnVy8O5YKhCTcPe4TrjrQatMrM2I1NgzzXQc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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