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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36230d3ccf9396c9fdadcb12000754b6c54103eea1d8bc5fe829da162d05bb51' 
  AND token = '3t7cg92ugGjirKoa5NEDt+KaunVkg8P0cVN7S6mD/dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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