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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15847fdd98937b00569dc300e0ed95590e55c838ce3e207c0c0d699b57237d3e' 
  AND token = '4pRpfoDSSjOIJ5VoT4SLGT8r3YG7b09/2gaFsI3Ikok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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