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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6ffe06e52e5da1668e06d6f660e9f2c56b635c780ccc9cbe7c5617d20a3e31' 
  AND token = 'mxDqcwdzXOTmVlHiT5zzE1WbZiQmc257GrOj6Uvm/VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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