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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79bb5f8145d03a2b4e5f5ddbf1564d6b130a3d3e369bf07e7a206987d57123f7' 
  AND token = 'TEBw2FguiT7rMVsPGEfRCbeb+DQg/EoN8DbnVb4Pgo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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